CN210818218U

CN210818218U - Overturning and distance-changing positioner and welding machine workstation

Info

Publication number: CN210818218U
Application number: CN201921427524.3U
Authority: CN
Inventors: 张宜晚; 夏志军; 高艳
Original assignee: Yangzhou Jinyuan Robotics Automation Co ltd
Current assignee: Yangzhou Jinyuan Robotics Automation Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-06-23
Anticipated expiration: 2029-08-30

Abstract

The utility model discloses a upset displacement machine and welding machine workstation. The overturning and pitch-changing positioner comprises a support mechanism, a pitch-changing positioning mechanism and a rotary driving mechanism, wherein the pitch-changing positioning mechanism comprises a mounting seat, a first linear driving unit, a first positioning unit and a second positioning unit; the welding machine workstation comprises an overturning and distance-changing positioner, a robot, a welding gun, a welding machine and a control cabinet, wherein the robot and the overturning and distance-changing positioner are arranged at intervals. The clamping of the box bodies to be welded with different lengths is realized through the overturning and distance-changing positioner, the welding gun is driven by the robot to be matched with the overturning and distance-changing positioner to weld the box bodies to be welded, the automatic welding is realized, and the welding efficiency and the welding quality are improved.

Description

Overturning and distance-changing positioner and welding machine workstation

Technical Field

The utility model relates to a welding frock still relates to the welding machine workstation of constituteing by this kind of welding frock and other welding equipment.

Background

Welding is the important link of gas tank box processing production, and the installation and the whole pleasing to the eye degree of the inside components and parts of gas tank are directly influenced to the welding good or bad, and current gas tank welding frock mainly has following problem:

1. the interchangeability is poor, the gas boxes with different sizes need to be fixed by different welding tools, the production cost is increased, and the replacement is troublesome;

2. the positioning reliability of the clamp is poor, the positioning is inaccurate, and the welding quality is influenced;

3. the structure is complex, the assembly and disassembly are troublesome, and the welding efficiency is influenced;

4. the continuous welding at the corners of the box body cannot be realized, and the corners need to be repaired and welded manually so as to ensure the air tightness of the gas box;

5. automatic welding is inefficient.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a welding tool, which can clamp gas tanks with different sizes; another object of the utility model is to provide a welding machine workstation realizes improving welded quality and efficiency to the welding of gas box.

In order to realize one of them purpose, the utility model provides a upset displacement machine:

a turnover displacement positioner, which comprises a support mechanism, a displacement positioning mechanism and a rotary driving mechanism, the variable pitch positioning mechanism comprises a mounting seat, a first linear driving unit, a first positioning unit and a second positioning unit, the mounting seat is arranged above the support mechanism and the rotary driving mechanism is arranged between the mounting seat and the support mechanism, the rotary driving mechanism is used for driving the mounting seat to rotate, one end above the mounting seat is fixedly provided with a first positioning unit, the other end is movably provided with a second positioning unit, the first linear driving unit is mounted to the mounting base and includes a movable end moving in a straight line, the first linear driving unit is connected with the second positioning unit and drives the second positioning unit to move towards or away from the first positioning unit, and the first positioning unit and the second positioning unit are used for positioning the box body to be welded.

The utility model discloses the during operation will treat that the welding box body is placed between first positioning unit and second positioning unit, through the motion of first linear drive unit drive second positioning unit orientation first positioning unit to treat the welding box body location through first positioning unit and second positioning unit messenger, realize the location of different length boxes, treat the welding box body along with displacement positioning mechanism's pivoted function through the realization of rotary drive mechanism.

Compared with the prior art, the beneficial effects of the utility model reside in that: the variable-pitch positioning mechanism is used for clamping the boxes with different lengths, and the rotary driving mechanism is used for rotating the boxes to be welded.

On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:

further: the support mechanism comprises a base, a first stand column and a second stand column, wherein the first stand column and the right end of the base are arranged at the left end of the base, the second stand column is arranged at the right end of the base, and the variable-pitch positioning mechanism is arranged between the first stand column and the second stand column. The beneficial effect of this step: the positioning of the variable-pitch positioning mechanism is realized through the first upright post and the second upright post.

Further: the rotary driving mechanism comprises a motor, a speed reducer, a first gear and an external tooth slewing bearing, the motor is mounted on the first upright post, the output shaft of the motor is arranged at the input end of the speed reducer, the first gear is mounted at the output end of the speed reducer, the first gear is meshed with the external tooth slewing bearing in a matching mode, the outer ring of the external tooth slewing bearing is mounted on the mounting seat, and the inner ring of the external tooth slewing bearing is mounted on the first upright post; a toothless slewing bearing is arranged between the second upright post and the mounting seat, the outer ring of the toothless slewing bearing is arranged on the mounting seat, and the inner ring of the toothless slewing bearing is arranged on the second upright post. The beneficial effect of this step: the installation seat is connected with the support machine component in a rotating mode through the external tooth slewing bearing and the toothless slewing bearing, speed reduction transmission is achieved through the motor and the speed reducer, rotation is transmitted to the installation seat through the first gear and the external tooth slewing bearing in a matched meshing mode, and rotation of the variable pitch positioning mechanism is achieved.

Further: it still includes arrestment mechanism, arrestment mechanism includes second sharp drive unit, brake block, second sharp drive unit includes along linear motion's expansion end, the brake block is installed in second sharp drive unit's expansion end, second sharp drive unit install in the second stand, the brake block orientation toothless slew bearing sets up. The beneficial effect of this step: the brake function of the mounting seat is realized through the brake mechanism.

Further: the first positioning unit comprises a first positioning plate and a conical surface pin, the second positioning unit comprises a second positioning plate and a conical surface pin, the conical surface pin is installed on the first positioning plate and the second positioning plate, the conical surface pin is provided with a positioning hole, and the positioning hole is used for being inserted into a positioning pin arranged on the box body to be welded. The beneficial effect of this step: the box body to be welded is positioned through the positioning hole.

Further: the variable-pitch positioning mechanism further comprises a guide unit, the guide unit comprises a guide rail and a first sliding block, at least one guide rail is arranged on the mounting base, the guide rail is parallel to the moving direction of the movable end, and the first sliding block is arranged on the guide rail in a sliding mode and is arranged below the second positioning plate. The beneficial effect of this step: the motion stability of the second positioning plate is improved through the guide mechanism.

Further: the variable-pitch positioning mechanism further comprises a supporting frame matched with the box body to be welded, and the supporting frame is arranged above the mounting seat and used for supporting the box body to be welded. The beneficial effect of this step: the box body to be welded is supported by the support frame, so that the box body to be welded is prevented from deforming in the welding process.

Further: the guide unit further comprises a second sliding block, and the second sliding block is installed at the lower end of the support frame and is in sliding connection with the guide rail. The beneficial effect of this step: through the cooperation of second slider and guide rail, make things convenient for the carriage to adjust the position on the guide rail.

In order to achieve another object, the utility model provides a welding machine workstation:

the automatic welding machine comprises an overturning and distance-changing positioner, the overturning and distance-changing positioner is used for clamping a box body to be welded, and the automatic welding machine further comprises a robot, a welding gun, a welding machine and a control cabinet, wherein the robot and the overturning and distance-changing positioner are arranged at intervals, the welding gun is installed in the robot, the control cabinet and the welding machine are arranged at intervals in the robot, the welding machine is used for supplying power to the welding gun, and the control cabinet is used for controlling the robot to drive the welding gun to weld the box body to be welded.

The utility model discloses the during operation treats the welding box through upset displacement machine centre gripping, and the welding box is welded to manipulator and the mutual coordinated action of upset displacement machine.

Compared with the prior art, the beneficial effects of the utility model reside in that: the welding of the box body to be welded is realized through the matching of the manipulator and the overturning and distance-changing positioner, the automatic welding of the box body to be welded is realized, and the welding quality and the welding efficiency are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a cross-sectional view taken along line C-C of FIG. 3;

FIG. 5 is a schematic view of the rotary driving mechanism;

FIG. 6 is a schematic structural view of a pitch-variable positioning mechanism;

FIG. 7 is an enlarged view of a portion D of FIG. 6;

FIG. 8 is an enlarged view of a portion E of FIG. 6;

FIG. 9 is a schematic diagram of a welder workstation.

The welding machine comprises a support mechanism 1, a base 101, a first upright post 102, a second upright post 103, a variable-pitch positioning mechanism 2, a 201 installation seat, a first linear driving unit 202, a first positioning unit 203, a second positioning unit 204, a guide unit 205, a guide rail 206, a first sliding block 207, a screw 208, a bracket 209, a hand wheel 210, a nut 211, a first positioning plate 212, a second positioning plate 213, a positioning sleeve 214, a conical pin 215, a locking nut 216, a groove 217, a positioning hole 218, a stud 219, a 220 support frame 221, a second sliding block 221, a rotating rod 222, a rotary driving mechanism 3, a motor 301, a reducer 302, a first gear 303, an external tooth rotary bearing 304, a toothless rotary bearing 305, a braking mechanism 4, a second linear driving unit 401, a brake pad 402, a robot 5, a welding gun 6, a welding machine 7, a control cabinet 8 and a gun cleaning and wire cutting station 9.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

As shown in fig. 1, 3, 4, 6, and 8, an overturning displacement positioner includes a support mechanism 1, a displacement positioning mechanism 2, and a rotary driving mechanism 3, where the support mechanism 1 includes a base 101, a first column 102, and a second column 103, the first column 102 is installed above one end of the base 101, the second column 103 is installed above the other end of the base 101 relative to the first column 102, the displacement positioning mechanism 2 is rotatably connected between the first column 102 and the second column 103, and the rotary driving mechanism 3 for driving the displacement positioning mechanism 2 to rotate is further disposed between the first column 102 and the displacement positioning mechanism 2; the variable-pitch positioning mechanism 2 comprises an installation base 201, a first linear driving unit 202, a first positioning unit 203 and a second positioning unit 204, one end of the installation base 201 is rotatably connected with the first upright post 102, the other end of the installation base 201 is rotatably connected with the second upright post 103, a rotary driving mechanism for driving the installation base 201 to rotate is arranged between the installation base 201 and the first upright post 102, the first positioning unit 203 is fixedly installed on one side, close to the first upright post 102, above the installation base 201, the second positioning unit 204 is movably arranged at the other end, close to the second upright post 103, a guiding unit 205 is further arranged between the second positioning unit 204 and the installation base 201, the guiding unit 205 comprises two guide rails 206 and two first sliding blocks 207, the two guide rails 206 are installed on the installation base 201, the two guide rails 206 are arranged in parallel, one end of each guide rail 206 faces the first positioning unit 203, the other end of each guide rail faces the second, the first linear driving unit 202 is mounted on the mounting base 201 and includes a movable end moving along a straight line, the movable end is connected with the second positioning unit 204 and drives the second positioning unit 204 to move towards or away from the first positioning unit 203 along the guide rail 206, the first linear driving unit 202 is a ball screw, a screw 208 in the ball screw is arranged parallel to the guide rail 206, two ends of the screw 208 are mounted on the mounting base 201 through a bracket 209, one end of the screw 208 is also mounted with a hand wheel 210, a nut 211 in the ball screw is the movable end and is mounted with the second positioning unit 204, the hand wheel 210 is manually rotated to drive the screw 208 to rotate, the rotation of the screw 208 is converted into the straight line movement of the nut 211, the nut 211 drives the second positioning unit 204 to move towards or away from the first positioning unit 203, the first positioning unit 203 and the second positioning unit 204 are used for positioning the boxes to be welded with different lengths, the first linear driving unit 202 can also be an air cylinder, an oil cylinder, an electric push rod and an electric hydraulic push rod, and the number of the first linear driving units 202 is not limited to one.

As shown in fig. 2, 5 and 7, the rotary drive mechanism 3 includes a motor 301, a reducer 302, a first gear 303, and an external gear slewing bearing 304, the motor 301 is mounted on the first column 102, an output shaft of the motor 301 is connected to an input end of the reducer 302, the reducer 302 is an AB-series planetary reducer, an output shaft of the reducer 302 is connected to the first gear 303, the first gear 303 is a straight cylindrical gear, the first gear 303 is in mesh with teeth on an outer circumferential surface of an outer ring of the external gear slewing bearing 304, wherein a pitch circle diameter of the first gear 303 is smaller than a pitch circle diameter of teeth of the outer ring on the external gear slewing bearing 304, the outer ring of the external gear slewing bearing 304 is mounted on an end portion of the mounting base 201 by bolts, an inner ring of the external gear slewing bearing 304 is mounted on an end surface of the first column 102 by bolts, one end of the mounting base 201 is rotatably connected to the first column 102 by the, a toothless slewing bearing 305 is arranged between the other end surface of the mounting base 201 and the second upright post 103, the outer ring of the toothless slewing bearing 305 is mounted on the mounting base 201 through bolts, the inner ring of the toothless slewing bearing 305 is mounted on the second upright post 103 through bolts, the other end of the mounting base 201 is rotatably connected with the second upright post 103 through the toothless slewing bearing 305, the rotation is transmitted to a first gear 303 through a speed reducer 302 through a motor 301, and the first gear 303 drives an external slewing bearing 304 to rotate, so that the mounting base 201 rotates; the second upright post 103 is further provided with a brake mechanism 4, the brake mechanism 4 comprises a second linear driving unit 401 and a brake pad 402, the second linear driving unit 401 is a cylinder, the brake pad 402 is an arc-shaped brake pad 402 matched with the outer periphery of the outer ring of the toothless slewing bearing 305 in shape, the brake pad 402 is installed at the end part of the piston rod of the cylinder, the cylinder is installed at the end surface of the second upright post 103, the brake pad 402 is arranged towards the toothless slewing bearing 305, the brake pad 402 is pushed to be locked with the outer ring of the toothless slewing bearing 305 through air inlet of the cylinder, and the outer ring of the toothless slewing bearing 305 is braked, so that the brake of the mounting seat 201 is realized, wherein the second linear driving unit 401 can be an oil cylinder, an electric push rod; the rotation driving mechanism 3 may also be a braking gear motor, at this time, only two ends of the mounting base 201 need to be respectively and fixedly connected with a rotating shaft, the rotating shaft is rotatably connected with the first upright post 102 and the second upright post 103, the braking gear motor is mounted on the first upright post 102 or the second upright post 103, and then an output shaft of the braking gear motor is connected with the corresponding rotating shaft through a coupler, so that the function of driving the rotating shaft to rotate or braking the rotating shaft is realized, and the rotation or braking of the mounting base 201 is realized.

As shown in fig. 3, 4 and 8, the first positioning unit 203 includes a first positioning plate 212, the second positioning unit 204 includes a second positioning plate 213, the first positioning unit 203 and the second positioning unit 204 together include a positioning sleeve, a conical pin 215, a lock nut 216, and a rotating rod 222, one end of the conical pin 215 is provided with a groove 217 along an axis, a bottom of the groove 217 is provided with a positioning hole 218 along the axis, the groove 217 is used for avoiding a welding seam of a positioning pin on the outer peripheral surface of a box body to be welded, the positioning hole 218 is used for inserting the positioning pin of the box body to be welded, the other end of the conical pin 215 is provided with a stud 219 along the axis, the outer peripheral surface of the conical pin 215 on one side of the stud 219 is a conical surface, the conical tip faces the stud 219, the positioning sleeve is provided with an installation hole for inserting the conical pin 215 along the axis, the installation hole is a through, the conical pin 215 is inserted into the mounting hole, the positioning hole 218 faces one side of the mounting base 201, the end face provided with the positioning hole 218 is located in the mounting hole, the stud 219 passes through the mounting hole and extends to the outside and is connected with a lock nut 216 through a thread, the lock nut 216 pulls the conical pin 215 through the thread and presses the conical face of the conical pin 215 against the conical face of the mounting hole, two rotating rods 222 are further arranged on the periphery of the lock nut 216, the rotating rods 222 can be directly welded on the surface of the lock nut 216, or holes are formed in the radial direction of the lock nut 216, and the rotating rods 222 are inserted into the holes formed in the radial direction of the lock nut 216, in this way, the conical pin 215 is easy to replace, according to the diameter of the positioning pin welded on the box body to be welded, the corresponding positioning hole 218 needs to be selected, so that the conical pin 215 with the, the locking nut 216 is separated from the stud 219, then the conical pin 215 is taken out of the mounting hole, and then the other conical pin 215 is inserted into the mounting hole, and the conical pin 215 is locked through the locking nut 216.

As shown in fig. 6 and 7, the pitch-variable positioning mechanism 2 further includes a supporting frame 220 matched with the box body to be welded, the supporting frame 220 is disposed above the mounting seat 201 and is used for supporting the box body to be welded, the guiding unit 205 further includes a second slider 221, the second slider 221 is mounted at the lower end of the supporting frame 220 through a bolt and is slidably connected with the guide rail 206, the supporting frame 220 has a shape matched with the box body to be welded, when the box body is disposed between the first positioning plate 212 and the second positioning plate 213, the supporting frame 220 is located inside the box body and is in contact with the inner wall of the box body, the supporting frame 220 is used for supporting the box body to be welded, and deformation.

Firstly welding positioning pins on the end surfaces of two ends of a box body to be welded, manufacturing a corresponding support frame 220 according to the shape of the box body to be welded, installing the support frame 220 on a second sliding block 221, adjusting the position of the support frame 220 on a guide rail 206 according to the box body to be welded, placing the box body to be welded between a first positioning plate 212 and a second positioning plate 213, wherein the middle part of the box body to be welded is supported by the support frame 220, one end of the box body to be welded is tightly attached to the first positioning plate 212, the positioning pins are inserted into the positioning holes 218 corresponding to the side of the first positioning plate 212, then rotating a hand wheel 210 to adjust the position of the second positioning plate 213 on the guide rail 206, so that the second positioning plate 213 is tightly attached to the other end surface of the box body to be welded, and the positioning pins on the other side of the box body to be.

As shown in fig. 9, a welding machine 7 workstation comprises an overturning displacement positioner, a robot 5, a welding gun 6, a welding machine 7, a control cabinet 8 and a gun cleaning and wire cutting station 9, wherein the robot 5 selects a loose TM2000 robot, the robot 5 and the overturning displacement positioner are arranged at intervals and are installed at the upper end of a robot installation support, the robot 5 is provided with the welding gun 6, the control cabinet 8, the welding machine 7, the gun cleaning and wire cutting station 9 and the robot 5 are arranged at intervals, the welding machine 7 is used for supplying power to the welding gun 6, the control cabinet 8 is used for controlling the robot 5 to drive the welding gun 6 to weld a box body to be welded, the gun cleaning and wire cutting station 9 is used for automatically cleaning the inside of the welding gun 6 and effectively preventing the adhesion of welding spatters, and the welding process is guaranteed to be completed uninterruptedly through the coordinated linkage work between the overturning displacement positioner and the robot 5, so that the welding quality and the welding.

Connection modes such as connection, setting, installation, rigid coupling can select suitable connection mode among the prior art that has existed, like welding, riveting, threaded connection, bonding, pin joint, key-type connection, connection modes such as elastic deformation connection, buckle connection, interference connection, in the actual production, should realize connecting the purpose, guarantee under the prerequisite of connection effect, according to production condition, select connection mode that the cost is lower, production efficiency is high.

In the specification of the present invention, a large number of specific details are explained. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides a upset displacement machine which characterized in that: comprises a support mechanism, a variable-pitch positioning mechanism and a rotary driving mechanism, wherein the variable-pitch positioning mechanism comprises a mounting seat, a first linear driving unit, a first positioning unit and a second positioning unit, the mounting seat is arranged above the support mechanism and the rotary driving mechanism is arranged between the mounting seat and the support mechanism, the rotary driving mechanism is used for driving the mounting seat to rotate, one end above the mounting seat is fixedly provided with a first positioning unit, the other end is movably provided with a second positioning unit, the first linear driving unit is mounted to the mounting base and includes a movable end moving in a straight line, the first linear driving unit is connected with the second positioning unit and drives the second positioning unit to move towards or away from the first positioning unit, and the first positioning unit and the second positioning unit are used for positioning the box body to be welded.

2. The roll-over pitch-changing machine according to claim 1, characterized in that: the support mechanism comprises a base, a first stand column and a second stand column, wherein the first stand column and the right end of the base are arranged at the left end of the base, the second stand column is arranged at the right end of the base, and the variable-pitch positioning mechanism is arranged between the first stand column and the second stand column.

3. The roll-over pitch-changing machine according to claim 2, characterized in that: the rotary driving mechanism comprises a motor, a speed reducer, a first gear and an external tooth slewing bearing, the motor is mounted on the first upright post, the output shaft of the motor is arranged at the input end of the speed reducer, the first gear is mounted at the output end of the speed reducer, the first gear is meshed with the external tooth slewing bearing in a matching mode, the outer ring of the external tooth slewing bearing is mounted on the mounting seat, and the inner ring of the external tooth slewing bearing is mounted on the first upright post; a toothless slewing bearing is arranged between the second upright post and the mounting seat, the outer ring of the toothless slewing bearing is arranged on the mounting seat, and the inner ring of the toothless slewing bearing is arranged on the second upright post.

4. The roll-over pitch-changing machine according to claim 3, characterized in that: it still includes arrestment mechanism, arrestment mechanism includes second sharp drive unit, brake block, second sharp drive unit includes along linear motion's expansion end, the brake block is installed in second sharp drive unit's expansion end, second sharp drive unit install in the second stand, the brake block orientation toothless slew bearing sets up.

5. The roll-over pitch-changing machine according to claim 1, characterized in that: the first positioning unit comprises a first positioning plate and a conical surface pin, the second positioning unit comprises a second positioning plate and a conical surface pin, the conical surface pin is installed on the first positioning plate and the second positioning plate, the conical surface pin is provided with a positioning hole, and the positioning hole is used for being inserted into a positioning pin arranged on the box body to be welded.

6. The roll-over pitch-changing machine according to claim 5, characterized in that: the variable-pitch positioning mechanism further comprises a guide unit, the guide unit comprises a guide rail and a first sliding block, at least one guide rail is arranged on the mounting base, the guide rail is parallel to the moving direction of the movable end, and the first sliding block is arranged on the guide rail in a sliding mode and is arranged below the second positioning plate.

7. The roll-over pitch-changing machine according to claim 6, characterized in that: the variable-pitch positioning mechanism further comprises a supporting frame matched with the box body to be welded, and the supporting frame is arranged above the mounting seat and used for supporting the box body to be welded.

8. The roll-over pitch-changing machine according to claim 7, characterized in that: the guide unit further comprises a second sliding block, and the second sliding block is installed at the lower end of the support frame and is in sliding connection with the guide rail.

9. A welder workstation, characterized in that: the overturning and distance-changing machine comprises the overturning and distance-changing machine according to any one of claims 1-8, and further comprises a robot, a welding gun, a welding machine and a control cabinet, wherein the robot and the overturning and distance-changing machine are arranged at intervals, the welding gun is installed on the robot, the control cabinet and the welding machine are arranged at intervals on the robot, the welding machine is used for supplying power to the welding gun, and the control cabinet is used for controlling the robot to drive the welding gun to weld a box body to be welded.